The reactivity enhancement and viscosity control are of practical importance during the manufacture of high-quality cellulose (also known as dissolving pulp). In the study, the concept of using phosphotungstic acid (HPW) for this purpose was demonstrated. The Fock reactivity of resultant pulp increased from 49.1% to 74.1% after the HPW catalytic treatment at a dosage of 86.4 mg HPW/g odp. The improved results can be attributed to the increased fiber accessibility, thanks to the favorable fiber morphologic changes, such as increased pore volume/size, water retention value and specific surface area. HPW can be readily recycled/reused by evaporating method, where maintaining 87.1% catalytic activity after six recycle times. The HPW catalytic treatment concept may provide a green alternative for the manufacture of high-quality dissolving pulp.

在制造高质量纤维素（也称为溶解纸浆）的过程中，提高反应活性和控制粘度至关重要。在研究中，证明了为此目的使用磷钨酸（HPW）的概念。在以86.4 mg HPW / g odp的剂量进行HPW催化处理后，所得纸浆的Fock反应性从49.1％增加至74.1％。由于有利的纤维形态变化，例如增加的孔体积/大小，保水值和比表面积，增加的结果可以归因于增加的纤维可及性。HPW可以很容易地通过蒸发方法进行回收/再利用，该方法在六次回收后可保持87.1％的催化活性。HPW催化处理概念可以为生产高质量的溶解纸浆提供绿色替代方案。