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通过沉淀、回流和掺杂等方法制备了ZrO2 呈四方相及单斜相的SO2 -4/ZrO2 (SZ) ,并用XRD ,TEM ,低温N2 BET和吡啶吸附IR等技术定量地测定和探讨了SZ的结构特征和表面超强酸性及其对丁烷异构化反应的催化活性 .结果表明 ,ZrO2 呈单斜相结构的SZ表面Br¨onsted(B)酸与Lewis(L)酸的浓度比 [B]/[L]较ZrO2 以四方相为主的SZ高约 4 0 % ,但其对丁烷异构化反应的比催化活性则较后者低约 31% ;由掺Mg2 + 所制备的ZrO2 呈四方相的SMZ具有与ZrO2 呈纯单斜相的SZ非常接近的 [B]/[L]比 ,且表现出比未掺Mg2 + 的ZrO2 以四方相为主的SZ更高的比催化活性 .从催化剂晶相结构对表面B酸浓度及强度影响的角度进行了讨论
SO2-4 / ZrO2 (SZ) with tetragonal and monoclinic phases of ZrO2 was prepared by precipitation, reflow and doping methods. The XRD, TEM, low temperature N2 BET and pyridine adsorption IR were used to quantitatively determine and discuss the effect of SZ The results showed that the concentration ratio of Br¨¨§ted (B) acid to Lewis (L) acid on SZ surface with monoclinic phase ZrO2 [ The specific catalytic activity of BZ / [L] to tetragonal SZ is about 40% lower than that of ZrO2, but its catalytic activity for butane isomerization is about 31% lower than that of ZrO2. The SMZ with tetragonal ZrO2 has a [B] / [L] ratio that is very close to the SZ with pure monoclinic phase of ZrO2 and shows a higher specific catalytic ratio of SZ than that of the undoped Mg2 + with tetragonal phase Activity from the point of view of the influence of the crystal structure of the catalyst on the acid concentration and the strength of the surface B