The catalytical characteristics of nine catalysts, such as sulfuric acid, benzene sulfonic acid, heteropolyacids and molecular sieve, etc., are studied for condensation of formaldehyde with xylene.

• 研究了硫酸、苯基磺酸、杂多酸、分子筛等9种催化剂对甲醛与二甲苯缩合反应的催化性能。