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考察了不同K含量对Pt-Sn/Al2O3催化剂异丁烷脱氢制异丁烯的影响,并通过比表面-孔分布测定、扫描电镜、吡啶吸附-红外等一系列表征手段探讨了K对Pt-Sn/Al2O3催化剂物理结构及表面酸性的影响。结果表明,加入K能有效降低催化剂表面的酸量,且主要表现在强L酸量的降低;随着K含量的增多,催化剂表面酸量减少,异丁烯选择性有显著提高;但当K质量分数超过0.8%时,反而会降低催化剂的脱氢活性;综合考虑脱氢活性和选择性,适宜K质量分数为0.4%~0.8%。
The effect of different K content on the isobutylene dehydrogenation of Pt-Sn / Al2O3 catalyst was investigated. A series of characterization methods such as specific surface-pore distribution, scanning electron microscopy and pyridine adsorption- / Al2O3 Catalyst Physical Structure and Surface Acidity. The results showed that adding K can effectively reduce the amount of acid on the surface of the catalyst, and mainly decreases the amount of strong L acid. With the increase of K content, the acidity of the catalyst surface decreases and the selectivity to isobutylene increases significantly. Exceed 0.8%, but will reduce the dehydrogenation activity of the catalyst; comprehensive consideration of dehydrogenation activity and selectivity, suitable K mass fraction of 0.4% to 0.8%.