This article is protected by copyright. All rights reserved Article Formation of Dead Zone in Catalytic Particles in Catalysis and Biocatalysis- New Alternative Method of Determination † Grzegorz Król, a Mirosław Szukiewicz, b , Marcin Chutkowski b a VanPur, Brewery in Rakszawa, Rakszawa, Poland b Faculty of Chemistry, Rzeszow University of Technology, Rzeszow, Poland * Corresponding author: Mirosław Szukiewicz, email: ichms@prz.edu.pl † This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: [10.1002/cjce.23383] Received 17 April 2018; Revised 19 June 2018; Accepted 16 July 2018 The Canadian Journal of Chemical Engineering This article is protected by copyright. All rights reserved DOI 10.1002/cjce.23383