Ibhola yodongwe eyomeleleyo ikwabizwa ngokuba ziibhola zokucoca. Yenziwe ngokwenza i-20-30% pores ngaphakathi kwiibhola ze-ceramic ze-inert. Yiyo ke loo nto ingasetyenziselwa ukuxhasa kunye nokugubungela i-catalyst kuphela, kodwa nokucoca nokususa ukungcola kokutya okuziinkozo, i-gelatin, i-asphalting, i-heavy metal kunye ne-ayoni yentsimbi engaphantsi kwe-25um. Ukuba ibhola enemingxunya ibekwe ngaphezulu kwento yokusombulula, ukungcola kuyasuswa kwinkqubo yangaphambili kunokufakwa iintengiso ngaphakathi kweebhola, apho kukhuselwe i-catalyst kunye nokwandisa umjikelo wokusebenza kwenkqubo. Njengoko ukungcola okhoyo kwimathiriyeli kwahlukile, umsebenzisi angayikhetha imveliso ngobungakanani bayo, iipore kunye ne-porosity, okanye ukuba kukho imfuneko, yongeza i-molybdenum, i-nickel kunye ne-cobalt okanye ezinye izinto ezisebenzayo ukuthintela i-catalyst ekuphekeni okanye kwiityhefu.