燃料化学学报 Pub Date : 2023-09-01 DOI: 10.1016/S1872-5813(23)60348-2

Zi-jian YANG , Shuai GUO , Xiao-fang WANG

{"title":"Effect of operating conditions on release and transformation of sodium during CFB gasification of Zhundong coal","authors":"Zi-jian YANG , Shuai GUO , Xiao-fang WANG","doi":"10.1016/S1872-5813(23)60348-2","DOIUrl":"https://doi.org/10.1016/S1872-5813(23)60348-2","url":null,"abstract":"<div>To provide some useful suggestions to the operation of circulating fluidized bed (CFB) gasifier, the effect of gasification temperature, residence time and agent on the release and transformation of sodium was studied by using a fixed bed reactor combined with Factsage software. The results indicated that gasification temperature was the significant factor to the release and transformation of sodium. For the promoting effect of sodium release, it was ascribed to the intense of sodium volatilization and competitive reaction between lime and meta-kaolin. Meanwhile, the high temperature promoted the formation of nepheline and slag. The threshold temperature of latter was near 950 °C. It was interesting to find that the release of sodium could be divided into two stages: coal pyrolysis and char gasification. In coal pyrolysis, part of organic and water-soluble sodium was released. The remainder either combined with char structure, or reacted with minerals. In char gasification, sodium, combined with char structure, was released along with char gasification. Due to the decrease of melting temperature and the formation of NaOH, steam showed a promoting effect on the sodium release. Oppositely, oxygen and nitrogen presented an inhibiting effect. The former was ascribed to the formation of Na2SO4, while the latter was caused by the chemical binding and physical wrapping effect of char.</div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"51 9","pages":"Pages 1232-1239"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49900262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of the PdAg/CDs composite and its catalytic performance in the hydrogenolysis of glucose PdAg/CDs复合材料的制备及其对葡萄糖氢解的催化性能

燃料化学学报 Pub Date : 2023-09-01 DOI: 10.1016/S1872-5813(23)60340-8

De-quan CHEN , An WANG , Gui-rong BAO , Peng GAO , Jia LUO , Xue-wu JI , Wen-yao Deng , Li LIU

引用次数: 0

In-situ catalytic pyrolysis of pine powder by ZnCl2 to bio-oil under mild conditions and application of biochar 温和条件下ZnCl2原位催化热解松粉制生物油及生物炭的应用

燃料化学学报 Pub Date : 2023-09-01 DOI: 10.1016/S1872-5813(23)60344-5

Zhao-bin PANG , Jian-gang WANG , Hong-you CUI , Jing-hua WANG

{"title":"In-situ catalytic pyrolysis of pine powder by ZnCl2 to bio-oil under mild conditions and application of biochar","authors":"Zhao-bin PANG , Jian-gang WANG , Hong-you CUI , Jing-hua WANG","doi":"10.1016/S1872-5813(23)60344-5","DOIUrl":"https://doi.org/10.1016/S1872-5813(23)60344-5","url":null,"abstract":"<div>Fast pyrolysis of biomass is an effective way for biomass conversion and utilization. However, the pyrolysis temperature is usually high because it is a non-catalytic process, resulting in the complicated composition of bio-oil and difficulty to control. Aiming to explore in-situ catalysis in this paper, the fast pyrolysis of lignin, cellulose, corncob and pine wood powder was studied using ZnCl2 as the catalyst. The activation energies of non-catalytic pyrolysis and catalytic pyrolysis were obtained based on kinetic fitting of their thermal gravimetric curves. The variation in pyrolysis oil composition was analyzed. It was found that ZnCl2 in situ catalysis could not only significantly reduce the pyrolysis temperature, but also simplify the resultant bio-oil composition. Even under pyrolysis temperature as low as 350 °C, fast pyrolysis of pine wood powder could achieve a yield of 47% of bio-oil, which was predominantly composed of the derivatives of cellulose and hemicellulose. ZnCl2 in situ catalysis could significantly decrease the activation energy of cellulose cracking from 304.78 to 112.46 kJ/mol, but has little effect on that of lignin. The carbon residue from ZnCl2-catalyzed pyrolysis was further carbonized at 600 °C, affording activated carbon with adsorption capacity of phenol up to 165 mg/g. The research work provides guidance and reference for the development of in-situ catalytic pyrolysis technology with high efficiency.</div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"51 9","pages":"Pages 1250-1258"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49900257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Kinetic analysis of biochar chemical looping gasification with calcium ferrite as oxygen carriers 铁酸钙为氧载体的生物炭化学环气化动力学分析

燃料化学学报 Pub Date : 2023-09-01 DOI: 10.1016/S1872-5813(23)60356-1

Pan GAO , Xing-qi HUANG , Yu-tong LIU , Aikeremu ABULAITI , Shao-xia YANG

{"title":"Kinetic analysis of biochar chemical looping gasification with calcium ferrite as oxygen carriers","authors":"Pan GAO , Xing-qi HUANG , Yu-tong LIU , Aikeremu ABULAITI , Shao-xia YANG","doi":"10.1016/S1872-5813(23)60356-1","DOIUrl":"https://doi.org/10.1016/S1872-5813(23)60356-1","url":null,"abstract":"<div>The chemical looping gasification (CLG) kinetics of biochars with calcium ferrite as oxygen carriers and the effects of different kinds of calcium ferrite and biochars were investigated by TGA. The properties of biochars and calcium ferrite were analyzed by XRD, SEM, BET, etc. The Škvára-Šesták method was used to determine the kinetic mechanism function. The results show that the reduction reaction rate and the oxygen carrying capacity of oxygen carriers follow the sequence: Ca2Fe2O5 > CaFe2O4 > Fe2O3, and CaFe2O4 > Ca2Fe2O5 > Fe2O3, respectively. The oxygen carriers can be completely reduced to Fe and CaO by biochar. The activation energy of CaFe2O4 reduction is in the range of 167.44–600.83 kJ/mol; and the activation energy of Ca2Fe2O5 reduction is in the range of 413.62–583.51 kJ/mol. The CaFe3O5 generated during the reduction of CaFe2O4 may have a negative influence on the lattice oxygen diffusion. The reduction of CaFe2O4 can be divided into two stages: when the conversion degree α is less than 0.15, the CaFe2O4 is reduced to Ca2Fe2O5 following the random nucleation and nuclei growth model; when α is greater than 0.15, Ca2Fe2O5 is further reduced to CaO and Fe following the 3-D diffusion mechanism. The mechanism function of the reduction of Ca2Fe2O5 is the same as that of the second stage of CaFe2O4 reduction.</div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"51 9","pages":"Pages 1259-1272"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49900259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of pretreatment conditions on the structure and catalytic performance of supported cobalt catalysts derived from metal-organic frameworks 预处理条件对金属-有机骨架负载型钴催化剂结构和催化性能的影响

燃料化学学报 Pub Date : 2023-09-01 DOI: 10.1016/S1872-5813(23)60352-4

Jia-qiang SUN , Shen-ke ZHENG , Jian-gang CHEN

{"title":"Influence of pretreatment conditions on the structure and catalytic performance of supported cobalt catalysts derived from metal-organic frameworks","authors":"Jia-qiang SUN , Shen-ke ZHENG , Jian-gang CHEN","doi":"10.1016/S1872-5813(23)60352-4","DOIUrl":"https://doi.org/10.1016/S1872-5813(23)60352-4","url":null,"abstract":"<div>Supported cobalt catalysts (Co@C-ZnZrO2 and Co/ZnZrO2) were prepared through a metal-organic frameworks (MOFs)-mediated synthesis strategy. The influence of MOFs pyrolysis on the structure and Fischer-Tropsch synthesis performance of supported cobalt catalysts was investigated. The crystalline phase and microstructure of supported cobalt catalysts were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), N2 adsorption-desorption and X-ray photoelectron spectroscopy (XPS). The Co/ZnZrO2 showed the CO conversion of 18.1% and the C5+ selectivity of 77.4%, whereas the Co@C-ZnZrO2 exhibited the CO conversion of 8.5% and the C5+ selectivity of 35.2%. The excellent CO conversion for Co/ZnZrO2 was attributed to the more exposure of active Co sites. Meanwhile, the activity of Co sites on Co@C-ZnZrO2 catalyst was restricted by the carbon layer, suppressing the adsorption and activation of syngas on Co sites.</div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"51 9","pages":"Pages 1291-1297"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49900255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of silicon oxide additive on the transformation characteristics of sodium and sulfur in Zhundong coal ash under atmospheric and elevated pressure 氧化硅添加剂对准东煤灰中钠和硫在常压和高压下转化特性的影响

燃料化学学报 Pub Date : 2023-09-01 DOI: 10.1016/S1872-5813(23)60353-6

Wu-yang XIAO , Bo WEI , Jian-jiang WANG , Jin-rong MA , Maierhaba ABUDOUREHEMAN , Xian LI , Hong YAO , Ze-ning CHENG

{"title":"Effect of silicon oxide additive on the transformation characteristics of sodium and sulfur in Zhundong coal ash under atmospheric and elevated pressure","authors":"Wu-yang XIAO , Bo WEI , Jian-jiang WANG , Jin-rong MA , Maierhaba ABUDOUREHEMAN , Xian LI , Hong YAO , Ze-ning CHENG","doi":"10.1016/S1872-5813(23)60353-6","DOIUrl":"https://doi.org/10.1016/S1872-5813(23)60353-6","url":null,"abstract":"<div>The effects of silicon oxide additive on the transformation characteristics of sodium and sulfur in coal ash under atmospheric and elevated pressure were investigated in this study. The results indicated that silicon oxide additive significantly inhibited the release of sodium under high pressure. The sodium content in ash with 4% of silicon oxide additive was 3.5% at 0.1 MPa, which was higher than that without additive. However, the sodium content increased to 5.4% without additive and 6.9% with 4% additive at 4 MPa, respectively. The sodium mainly existed in the forms of NaAlSiO4 and NaAlSi3O8 at 0.1 MPa, and the content of NaAlSiO4 increased with increasing additive dosage, which weakened the agglomeration of ash. The decomposition of low melting point mineral CaSO4 was inhibited at 4 MPa, and the formation of Na6Ca2Al6Si6O24(SO4)2 from NaAlSiO4 and CaSO4 was promoted significantly with increasing additive dosage. Furthermore, the inhibition mechanism of sodium and sulfur released from coal ash by silicon oxide under high pressure was proposed.</div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"51 9","pages":"Pages 1220-1231"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49900258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relationship between fluorescence characteristics of coal macerals and excitation time 煤显微组织荧光特性与激发时间的关系

燃料化学学报 Pub Date : 2023-09-01 DOI: 10.1016/S1872-5813(23)60339-1

Ya-ru ZHANG , Jin-feng BAI , Li-jun JIN , Yang LI , Hao-quan HU

{"title":"Relationship between fluorescence characteristics of coal macerals and excitation time","authors":"Ya-ru ZHANG , Jin-feng BAI , Li-jun JIN , Yang LI , Hao-quan HU","doi":"10.1016/S1872-5813(23)60339-1","DOIUrl":"https://doi.org/10.1016/S1872-5813(23)60339-1","url":null,"abstract":"<div>The fluorescence characteristics of coal macerals can be used as one of the indexes to evaluate the properties of coking coal. In this work, a single-wavelength laser with a wavelength of 360 nm was used as the excitation source to excite the surface of particulate block under a polarizing microscope. Effect of excitation time on fluorescence characteristics of the macerals was studied. The relationship between spontaneous fluorescence intensity and the excitation time of each maceral of six kinds of coking coals show that the fluorescence characteristics of coal macerals are related to the type and metamorphism of coal. The excitation time has a certain effect on the fluorescence parameters of the macerals. By comparing the relative fluorescence intensity values under different excitation times, it is found that the mean relative fluorescence intensity within 15 s can be used as an optical parameter to characterize the structure and metamorphic grade of different macerals. The essence of this method is to express movement of electrons in outer layer of nucleus by macroscopic fluorescence spectrum and relative fluorescence intensity of the initial state value and simplify microscopic complexity into macroscopic and numerical form generally accepted.</div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"51 9","pages":"Pages 1209-1219"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49900263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of flotation refined carbon from gasification slag 以气化渣为原料制备浮选精炭

燃料化学学报 Pub Date : 2023-08-01 DOI: 10.1016/S1872-5813(23)60354-8

Peng ZHAO , Gang WANG , Li-hong KOU , Hao WANG , Min LIU , Peng HUANG , Zhen CUI

{"title":"Preparation of flotation refined carbon from gasification slag","authors":"Peng ZHAO , Gang WANG , Li-hong KOU , Hao WANG , Min LIU , Peng HUANG , Zhen CUI","doi":"10.1016/S1872-5813(23)60354-8","DOIUrl":"https://doi.org/10.1016/S1872-5813(23)60354-8","url":null,"abstract":"<div>Highly efficient and environmentally friendly utilization of coal gasification slag is a hot research subject in the coal chemical industry at present. The preparation of activated carbon with a flotation refined carbon from gasification slag, a long flame coal, a high temperature coal tar containing 70% asphalt and an active agent in proper proportion was carried out. The influence of activation temperature and time on the surface properties and compressive strength of the produced activated carbon was investigated in a tube furnace. The oxygen functional group, pore structure and absorption performance of the produced activated carbon were characterized by FT-IR, N2 adsorption-desorption, SEM and iodine adsorption. The COD removal from biochemical waste water by the produced activated carbon was verified. The results show that the key factors for the effective formation and expansion of pore are the suitable activation temperature and time for the floatation refined carbon from gasification slag as the feedstock. The activated carbon prepared by carbonization at 550 °C for 30 min and steam activation at 950 °C for 2 h exhibits a crisscross morphology of organic carbon components and minerals. The surface area, pore capacity and average pore diameter are 566 m2/g, 0.5611 mL/g and 5.1 nm, respectively, with the characteristics of a concentrated pore distribution and a certain quantity of mesopore. Both iodine value (650 mg/g) and methylene blue value (128 mg/g) meet the requirements of the Chinese standard “Technical Specifications and Test Methods of Activated Carbon for Purification of Industrial Wastewater”. The COD in biochemical waste water treated by the activated carbon for 60 min with a solid-to-liquid ratio of 0.6 g/L can be reduced to lower than 30 mg/L, meeting the B class water quality of the Chinese standard “Integrated Discharge Standard of Water Pollutants” (DB11/307—2013).</div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"51 8","pages":"Pages 1193-1200"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49887744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analyzing the pyrolysis mechanism of avermectin via experiments and density functional theory 通过实验和密度泛函理论分析了阿维菌素的热解机理

燃料化学学报 Pub Date : 2023-08-01 DOI: 10.1016/S1872-5813(23)60367-6

Hao ZHOU , Su-xiang LIU , Bao-feng ZHAO , Jing-wei WANG , Hai-bin GUAN , Di ZHU , Huan LI , An-gang SONG

引用次数: 0

Preparation of rice husk-based carbon supported ruthenium catalyst for the hydrolysis of ammonia borane to produce hydrogen 稻壳基碳负载钌催化氨硼烷水解制氢的制备

燃料化学学报 Pub Date : 2023-08-01 DOI: 10.1016/S1872-5813(23)60349-4

Hui WU , Jun-ning ZHENG , You-hua ZUO , Li-xin XU , Ming-fu YE , Chao WAN

引用次数: 0

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