淀粉改性SiO<sub>2</sub>载体的预处理温度 对其负载的铜基催化剂甲醇转化性能的影响

谷传涛; 李光俊; 胡蕴青; 庆绍军; 侯晓宁; 高志贤

淀粉改性SiO₂载体的预处理温度对其负载的铜基催化剂甲醇转化性能的影响

1.
中国科学院山西煤炭化学研究所煤转化国家重点实验室, 山西太原 030001;
2.
中国科学院研究生院, 北京 100049

基金项目: 煤转化国家重点实验室开放基金(11-12-308)。

详细信息

通讯作者:
高志贤,Tel:0351-4067440,E-mail:gaozx@sxicc.ac.cn

中图分类号: O643.36
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- 被引次数: 0
出版历程
- 收稿日期: 2012-02-08
- 修回日期: 2012-04-16
- 刊出日期: 2012-11-30

Effect of calcination temperature of starch-modified silica on the performance of silica supported Cu catalyst in methanol conversion

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
Graduate University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 以淀粉为改性剂制备了淀粉改性的SiO₂载体(SSi),经不同温度(T)焙烧处理后再负载活性铜组分(10%,质量分数),获得一系列铜基催化剂(Cu/SSi-T);采用TG、FT-IR、XRD、H₂-TPR、SEM和氮气吸附等技术对载体和催化剂进行了表征,并考察了其对甲醇低温转化反应催化性能。结果显示,淀粉的存在可以减缓载体表面硅羟基的脱除速度;载体表面硅羟基有利于铜物种的分散,从而提高催化剂的活性。不同预处理温度能调变载体表面硅羟基浓度、比表面积和孔结构,并对催化剂上铜物种的晶粒大小及其催化性能有显著的影响。
- 二氧化硅 /
- 淀粉改性 /
- 铜基催化剂 /
- 预处理温度 /
- 甲醇转化 /
- 甲酸甲酯
Abstract: A series of starch-modified SiO₂ (SSi-T) were obtained by calcining the extrudate of SiO₂ and starch at different temperatures (T) and used as the support to prepare Cu catalysts (Cu/SSi-T, 10%) by the impregnation method. The Cu catalysts were characterized by N₂ sorption, FT-IR, TG, XRD, SEM and H₂-TPR; their catalytic performance in methanol conversion was investigated in a fixed bed reactor. The results indicated that starch can reduce the removal rate of silanol groups (Si-OH) from the surface of the support during calcination and the surface silanol groups are beneficial to the dispersion of Cu species. The calcination temperature of starch-modified SiO₂ exhibits a significant influence on the surface silanol (Si-OH) concentration, the surface area and porous structure of the support; as a result, it may be used to adjust the size of supported CuO crystal grains and dispersion of Cu species, which determine the performance of the silica supported Cu catalysts in methanol conversion.
- silica /
- starch-modification /
- Cu-based catalyst /
- calcination temperature /
- methanol conversion /
- methyl formate

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参考文献(26)

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