Cowhide collagen fibers were used as biotemplates to prepare a series of fibrous SO42-/ZrO2-NiO solid acid catalysts. The as-prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), N(2 )adsorption/desorption isotherms and the temperature-programmed decomposition (TPD), respectively. The characterization suggested that the SO42-/ZrO2-NiO catalysts have well-defined fibrous morphology which maintains the fibrous structure of cowhide collagen fibers. TPD of ammonia indicated that the catalyst had both medium strong acidic sites and strong acidic sites. The esterification of acetic acid with n-butanol was utilized as model reaction to evaluate the catalytic performance of the catalysts. The catalyst has exhibited high catalytic activity and good reusability.

催化氧化苯甲醇是制备苯甲醛的一种简便高效的方法.以天然高分子黑荆树单宁（BWT）为两亲性稳定剂,制备水溶性钯纳米胶体催化剂,用于苯甲醇的氧化反应.采用透射电镜（TEM）、傅里叶变换红外光谱（FT-IR）等表征手段表征所制备催化剂的形貌,探讨制备条件对催化剂形貌的影响.TEM测试表明,单宁的用量对胶体中钯纳米粒子的粒径具有显著的影响,随着BWT用量从2 mg增加到60 mg,Pd粒子的粒径呈现减小趋势.FT-IR测试表明,BWT通过其结构中大量的酚羟基对Pd纳米粒子进行稳定和分散.系统考察单宁用量、反应温度、反应时间等因素对Pd纳米胶体在苯甲醇氧化反应中活性的影响,结果表明:当BWT用量为15 mg时制备的BWT15 mg-Pd胶体催化剂在50℃,空气气氛下8 h催化苯甲醇的转化率高达98.58%; BWT用量对催化剂重复使用性能也有显著的影响,BWT15 mg-Pd可以重复使用5次转化率仍然在90%以上,明显优于BWT5 mg-Pd和BWT60 mg-Pd.

Noble metal nanoparticles are promising candidates to replace conventional bulk counterparts owing to their high activity and selectivity. To enable catalyst recovery, noble metal nanoparticles are often supported onto solid matrices to prepare heterogeneous catalyst. Although recycle of noble metal nanoparticles is realized by heterogenization, a loss of activity is usually encountered. In the present investigation, Pt nanoparticles with tunable particle size (1.85–2.80 nm) were facilely prepared by using polyphenols as amphiphilic stabilizers. The as-prepared Pt nanoparticles colloid solution could be used as highly active catalyst in aqueous–organic biphasic catalysis. The phenolic hydroxyls of polyphenols could constrain Pt nanoparticles in aqueous phase, and simultaneously, the aromatic scaffold of polyphenols ensured effective interactions between substrates and Pt nanoparticles. As a consequence, the obtained polyphenols-stabilized Pt nanoparticles exhibited high activity and cycling stability in biphasic hydrogenation of a series of unsaturated compounds. Compared with conventional heterogeneous Pt-C and Pt-Al2O3 catalysts, polyphenols-stabilized Pt nanoparticles showed obvious advantage both in activity and cycling stability.