Effect of Si/Al2 Ratio Over Zeolite Beta in Steam and Direct Catalytic Cracking of n-dodecane

IF 3.2 4区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
Arumugam Ramesh, Jun-Hyuk Ahn, Su-Un Lee, Kwang-Eun Jeong, Temur Khujamuratov, Tae-Wan Kim, Chul-Ung Kim
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引用次数: 0

Abstract

To achieve a higher light olefin yield for the catalytic cracking of kerosene and diesel, the effect of the Si/Al2 ratio (SAR) of zeolite beta (BEA) in steam catalytic cracking (SCC) and direct catalytic cracking (DCC) of n-dodecane (n-C12) was investigated in a fixed bed reaction system over zeolite beta with SAR in a range of 25–360. The catalysts were characterized by XRD, NH3-TPD, pyridine FT-IR, N2-sorption, SEM, and TGA. In both DCC and SCC, n-C12 conversion showed a tendency to decrease linearly as the BA (Brønsted acidity) of the zeolite beta catalyst increased. Both the light olefin yield and the light olefin/paraffin ratio in SCC were higher than that in DCC, where the steam in SCC acts as a diluent, thereby decreasing the partial pressure of the reactants and reducing the formation of paraffins. Through optimization of the operation variables, light olefin yield exceeding 74.3 wt% was obtained in SCC using high silica zeolite beta catalysts with SAR = 300 at TOS = 1 h, 650 °C, and 4.2 h−1.

蒸汽沸石上硅铝比对正十二烷直接催化裂化的影响
为了在煤油和柴油催化裂化中获得更高的轻质烯烃收率,在固定床反应体系中研究了沸石(BEA)的Si/Al2比(SAR)对正十二烷(n-C12)蒸汽催化裂化(SCC)和直接催化裂化(DCC)的影响。采用XRD、NH3-TPD、吡啶FT-IR、n2吸附、SEM和TGA对催化剂进行了表征。在DCC和SCC中,n-C12转化率随沸石β催化剂的BA (Brønsted酸度)的增加呈线性降低的趋势。SCC的轻烯烃产率和轻烯烃/石蜡比均高于DCC,其中SCC中的蒸汽作为稀释剂,从而降低了反应物的分压,减少了石蜡的形成。通过对操作变量的优化,采用SAR = 300的高硅沸石β催化剂,在温度为650℃、温度为4.2 h−1、温度为1 h的条件下,SCC的轻烯烃收率超过74.3 wt%。
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来源期刊
Korean Journal of Chemical Engineering
Korean Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
4.60
自引率
11.10%
发文量
310
审稿时长
4.7 months
期刊介绍: The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.
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