异丁烷正构化Pt/Beta催化剂中Pt的作用研究  

The Role of Pt in i-Butane Normalization Reaction Catalyzed by Pt/Beta Zeolite

作　　者：郭纬杨 张成喜 邢恩会 慕旭宏 GUO Weiyang;ZHANG Chengxi;XING Enhui;MU Xuhong(State Key Laboratory of Catalytic Material and Reaction Engineering,SINOPEC Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100083,China)

机构地区：[1]中石化石油化工科学研究院有限公司石油化工催化材料与反应工程全国重点实验室,北京100083

出　　处：《石油学报（石油加工）》2024年第6期1537-1548,共12页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(22108312)资助。

摘　　要：当前减油增化的大趋势下,正丁烷相比异丁烷在化工利用方面综合效益更高,近些年异丁烷正构化成为了学术界和工业界的关注热点。通过控制Pt负载量和负载位置研究了Pt负载沸石催化剂在异丁烷正构化反应中Pt的作用。结果表明:由于丁烷的异-正转化是吸热反应,反应需要在较高的温度下进行;引入Pt组元可以提高异丁烷转化率,但过多的Pt会促进丁烷裂解生成甲烷和乙烷,降低正丁烷的选择性;质量分数0.10%Pt/HBeta催化剂可以得到良好的催化效果,在反应温度470℃、反应压力2.6 MPa,异丁烷质量空速12 h^(-1)的条件下,正丁烷收率大于39%,对甲烷、乙烷选择性极低。异丁烷正构化反应需要一个适中的金属中心与酸中心的接近度,Pt和酸中心间距离过远会导致裂化副产物增多。Under the trend of reducing oil products and increasing chemicals,i-butane normalization has attracted more attention from the academic and industrial circles due to the higher comprehensive benefits of n-butane compared with i-butane in chemical applications.The role of Pt-supported zeolite catalysts in i-butane normalization reaction was studied by controlling Pt loadings and loading positions.The results show that the reaction conversion of i-butane to n-butane needs to be performed at a high temperature due to its endothermic property.The introduction of Pt components can increase the conversion rate at lower temperatures,but too many metal centers will reduce the selectivity of n-butane;0.10%Pt/HBeta has achieved a superior catalytic performance,of which the n-butane yield is greater than 39%,and the selectivity to methane and ethane is extremely low under reaction temperature of 470℃,reaction pressure of 2.6 MPa,i-butane mass hourly space velocity(MHSV)of 12 h^(-1).The large distance between the metal and acid centers will lead to an increase in production of by-products from cracking,and thus the normalization reaction of i-butane requires a moderate proximity between the metal center and the acid center.

关 键 词：异丁烷 正丁烷 Pt/Beta分子筛 双功能催化剂 正构化反应 

分 类 号：TE624.4[石油与天然气工程—油气加工工程]