Influence of the Severity of Reaction Conditions on the Promotional Effects of Tin in Pt–Sn/γ-Al2O3 Catalysts in Propane Dehydrogenation

IF 1.3 4区 工程技术 Q3 CHEMISTRY, ORGANIC
Parisa Moghimpour Bijani, Abbas Ali Khodadadi, Saeed Sahebdelfar
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Abstract

The influence of the severity of reaction conditions on the promotional effects of tin in bimetallic Pt–Sn/γ-Al2O3 catalysts in the propane dehydrogenation was studied over a wide range of reaction conditions (550–600°C, H2/C3H8 = 0.4–1.5 mol/mol). The catalysts containing 0.5 wt % Pt with variable (0–1.0 wt %) Sn loading were prepared by sequential impregnation and characterized by N2-physisorption, TPR, TPD, EDX, and TEM techniques. When 0.25 wt % tin was added to the Pt/γ-Al2O3 catalyst, at H2/C3H8 molar ratios of 0.8 and 1.5 and all temperatures, a sharp (up to 100%) increase in the propylene selectivity was observed. The propylene yield vs. Sn loading curves showed maxima near the Sn/Pt weight ratio of 1 independently of operating conditions. Upon addition of the optimum amount of Sn, the first-order decay rate constant decreased from 0.15 to 0.066 h–1 at 550°C and H2/C3H8 = 0.4, which roughly corresponded to doubling of the catalyst lifetime under this condition. The promoting effect of Sn on the catalyst performance was more pronounced under more severe reaction conditions required for higher propane conversions, i.e., at higher temperatures and lower H2/C3H8 ratios in the feed.

Abstract Image

Abstract Image

丙烷脱氢过程中反应条件的苛刻程度对 Pt-Sn/γ-Al2O3 催化剂中锡的促进作用的影响
在广泛的反应条件(550-600°C,H2/C3H8 = 0.4-1.5 mol/mol)下,研究了丙烷脱氢反应中双金属 Pt-Sn/γ-Al2O3 催化剂中锡的促进作用受反应条件苛刻程度的影响。通过顺序浸渍法制备了含 0.5 wt % Pt 和不同(0-1.0 wt %)锡负载的催化剂,并通过 N2-吸附、TPR、TPD、EDX 和 TEM 技术对其进行了表征。当在 Pt/γ-Al2O3 催化剂中添加 0.25 wt % 的锡时,在 H2/C3H8 摩尔比为 0.8 和 1.5 以及所有温度条件下,丙烯选择性都有大幅提高(最高可达 100%)。丙烯产率与锡负载量的关系曲线在锡/铂重量比为 1 附近显示出最大值,与操作条件无关。在 550°C 和 H2/C3H8 = 0.4 条件下,添加最佳量的锡后,一阶衰减速率常数从 0.15 h-1 降至 0.066 h-1,这大致相当于催化剂寿命在此条件下延长了一倍。在提高丙烷转化率所需的更苛刻的反应条件下,即在更高温度和进料中 H2/C3H8 比率更低的条件下,Sn 对催化剂性能的促进作用更为明显。
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来源期刊
Petroleum Chemistry
Petroleum Chemistry 工程技术-工程:化工
CiteScore
2.50
自引率
21.40%
发文量
102
审稿时长
6-12 weeks
期刊介绍: Petroleum Chemistry (Neftekhimiya), founded in 1961, offers original papers on and reviews of theoretical and experimental studies concerned with current problems of petroleum chemistry and processing such as chemical composition of crude oils and natural gas liquids; petroleum refining (cracking, hydrocracking, and catalytic reforming); catalysts for petrochemical processes (hydrogenation, isomerization, oxidation, hydroformylation, etc.); activation and catalytic transformation of hydrocarbons and other components of petroleum, natural gas, and other complex organic mixtures; new petrochemicals including lubricants and additives; environmental problems; and information on scientific meetings relevant to these areas. Petroleum Chemistry publishes articles on these topics from members of the scientific community of the former Soviet Union.
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