[ certification ]
standards . Voluntary certification schemes already enable economic operators to provide clear proof of the carbon footprint of their hydrogen .
Mass-balance approach to keep track of emissions
The GreenHydrogen certificate is based on the
TÜV SÜD CMS 70 ‘ Generation of Green Hydrogen ’ standard . According to this , green hydrogen must reduce greenhouse gas emissions by at least 70 % compared to the reference value for biofuels – including production and distribution as well as transport to the customer or fuelling station . In GreenHydrogen certification , the emissions caused by hydrogen transport are calculated using the mass-balance approach . This means that green and conventional hydrogen can be mixed in the distribution chain . Thus , the certificate does not require any additional infrastructure .
GreenHydrogen certification also considers the origin of the energy and the type of feedstock used in hydrogen production . Certifiable methods include electrolysis of both water and brines . The electricity used must be generated from renewables such as wind , solar or hydro power
The colours of hydrogen
Grey hydrogen is produced the conventional way from fossil sources . The process used is generally steam reforming , in which heat is applied to decompose natural gas ( NG ) into
CO 2 and hydrogen . This hydrogen production method is not carbon neutral since CO 2 is released unused into the atmosphere . Blue hydrogen , like grey hydrogen , is gained by conventional methods from fossil sources . The CO 2 produced is sequestered and stored for long periods , usually underground . Experts are divided over whether blue hydrogen may be regarded as carbon neutral or not . Turquoise hydrogen is produced by pyrolysis using NG . The process produces solid carbon as a hydrogen by-product instead of volatile CO 2
. Therefore , turquoise hydrogen can be regarded as carbon neutral under specific conditions , e . g ., where process heat is produced using energy from renewable sources and CO 2 is sequestered in the long term . Green hydrogen is produced using energy from renewable sources and meeting defined sustainability criteria .
plants , or by steam reforming of biomethane or by pyrolysis ( gasification ) and catalytic inline reforming in waste incineration plants .
Auxiliary consumption
Electricity
Electricity Biomethane
Auxiliary consumption
Hydrogen production
Conditioning for transport
CertifHy / TÜV SÜD CMS70 GreenHydrogen basic TÜV SÜD CMS70 GreenHydrogen + / RED II
42 Hydrogen Tech World | Issue 6 | October 2022